Rubio dumped a lot of opposition research on Trump—about the immigrants who built Trump Tower and the foreign workers he’s brought in to avoid paying American laborers over the years. Rubio wisely punctuated each of these lines with Googling instructions for viewers at home.

That is a smart tactic in the ever-present fight for politicians to have their statements believed by doubting voters: invite voters to fact check your comments there and then as you make them. And have your online advertising team on hot standby in case an opposing campaign tries to make mischief.